| Summary: | 碩士 === 國立中央大學 === 化學學系 === 107 === In this work, DIR (Diindeno[1,2-g:1',2'-s]rubicene) derivatives are synthesized as electron acceptors in polymer solar cells. In this design, an A-D-A structure with ICT phenomenon is used. The system uses DIR as part of D and has two DIR cores, which are linear (octyl) and branched (2-Ethyl-1-hexyl) carbon chains. In the part of A, three kinds of electron withdrawing groups, 5,5-Dimethyl-1,3-cyclohexanedione (DCD), 2-(3-Oxo-inden-1-ylidene)malononitrile (IC), 2-(5,6-Difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (IC2Cl). By substitution, a total of six non-fullerene electron acceptors with DIR as the core were synthesized, which were OcDCD, OcIC, OcIC2Cl, EHDCD, EHIC, and EHIC2Cl. We performed a series of measurements on these six non-fullerene electron acceptors (NFA). These include thermal properties, absorption spectra, energy level measurements, theoretical calculation of energy level electronic cloud distribution. Evaluation of PCBM electron acceptor materials in substituted polymer solar cells from the above results.
The absorption of the ICT phenomenon is enhanced by the A-D-A structure, and the absorption wavelength is red-shifted. The original DIR structure is mainly absorbed at 300-400 nm (near ultraviolet absorption peak), and the main absorption is red-shifted to 500-650 nm (visible light absorption peak) after the electron-withdrawing group is attached. At the same time, when the strong electron withdrawing group is introduced, the LUMO energy level is significantly decreased, and the LUMO energy level is lowered to be close to the PCBM, so as to achieve a better disassembly of the polymer exciton.
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